/Engine/Plugins/Experimental/SlateScreenReader/Source/SlateScreenReader/Public/SlateScreenReaderEngineSubsystem.h
Returns true if the screen reader is currently active and accessibility services such as text to speech can be used by the screen reader users. Otherwise, it returns false.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="SlateScreenReader") bool IsScreenReaderActive() const